Question

What is atomic number? Write the atomic number of first five elements of the periodic table. Also name the elements.
PLEASE HELP ​

Answer 1

Answer:

the atomic number is the number of protnos in the nucleaus of an atom.

Explanation:

1) hydrogen (h)

2) helium (he)

3) lithium (li)

4) berilium (be)

5) boron (b)

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Answer 2

Atomic number is the number of protons present in the nucleus
*an easy trick to find out the atomic number is by the number of the element in the periodic table*
Your answer:-
Hydrogen- 1
Helium - 2
Lithium - 3
Beryllium - 4
Boron - 5
Hope it helps:)